90&deg; + Motorcycle Straight Air Valve, Forged AL. 11.3mm SET, Black Forged and CNC machined 7075 T6 Aluminum Two sizes available for use with nearly all Asian (11.3mm) or European (8.3mm) 90 degree angle is perfect for front wheels with large rotors Short straight valve stem is perfect for back tires Metal valve stems are required by racing associations to prevent air loss from weak rubber stems